[將字串做 Gzip 壓縮/解壓縮] #dotnet

GzipCompressString.cs

void Main()
{
    var rawString = "Hi, my name is Poy Chang. I am currently conducting a project of enterprise app through Angular and .NET Core. As a developer and designer, I believe that keep learning and practicing is the most important thing. Reading, watching movies and traveling are also my favorites in my life.";

    var zippedString = GZipCompressString(rawString);
    Console.WriteLine($"壓縮結果：\r\n{zippedString}\r\n");

    var unzipString = GZipDecompressString(zippedString);
    Console.WriteLine($"解壓縮後：\r\n{unzipString}\r\n");

}

// 壓縮
public string GZipCompressString(string rawString)
{
    using (var memoryStream = new MemoryStream())
    using (var gzipStream = new GZipStream(memoryStream, CompressionMode.Compress, true))
    {
        var rawData = Encoding.UTF8.GetBytes(rawString);
        gzipStream.Write(rawData, 0, rawData.Length);
        gzipStream.Close();
        
        return Convert.ToBase64String(memoryStream.ToArray());
    }
}

// 解壓縮
public string GZipDecompressString(string zippedString)
{
    if (string.IsNullOrEmpty(zippedString))
    {
        return string.Empty;
    }
    else
    {
        var zippedData = Convert.FromBase64String(zippedString);

        using (var memoryStream = new MemoryStream(zippedData))
        using (var gzipStream = new GZipStream(memoryStream, CompressionMode.Decompress))
        using (var outBuffer = new MemoryStream())
        {
            var block = new byte[1024];
            while (true)
            {
                var bytesRead = gzipStream.Read(block, 0, block.Length);
                
                if (bytesRead <= 0) break;
                
                outBuffer.Write(block, 0, bytesRead);
            }

            return Encoding.UTF8.GetString(outBuffer.ToArray());
        }
    }
}